@dammy1222,
We live in a different world dammy. Not all girls want to get hitched at 20 years of age, in-fact most guys that age aren't ready either.
There are friendships, laughter, parties, girls nights out, in, careers, fun, ....
Getting married usually means staying at home with your husband.
If you have seen the girls over 4 years and you say 20 (teenager) then 16-20 yep, the girls just want to have fun... Not get into a serious marriage situation, boyfriend is enough for them and that way they can still have their lives, friends, career and not worry about husbands and babies yet.